Other sectors also at risk from attacks, including healthcare, finance and telecommunications, expert warnsFollow our Australia news live blog for latest updatesGet our breaking news email, free app or daily news podcastAll it can take is a phone call. That’s what Qantas learned this week when the personal information of up to 6 million customers was stolen by cybercriminals after attackers targeted an offshore IT call centre, enabling them to access a third-party system.It is the latest in a series of cyber-attacks on large companies in Australia involving the personal information of millions of Australians, after the attack on Optus, Medibank and, most recently, Australia’s $4t superannuation sector.